$E5B4/58804: Get Character From Keyboard Buffer
Jump from $E5E7, $F147:
E5B4: AC 77 02 LDY $0277 ; Keyboard Buffer Queue (FIFO)
E5B7: A2 00 LDX #$00
Jump from $E5C2:
E5B9: BD 78 02 LDA $0278,X ; Keyboard Buffer Queue (FIFO)
E5BC: 9D 77 02 STA $0277,X ; Keyboard Buffer Queue (FIFO)
E5BF: E8 INX
E5C0: E4 C6 CPX $C6 ; Number of Characters in Keyboard Buffer queue
E5C2: D0 F5 BNE $E5B9
E5C4: C6 C6 DEC $C6 ; Number of Characters in Keyboard Buffer queue
E5C6: 98 TYA
E5C7: 58 CLI
E5C8: 18 CLC
E5C9: 60 RTS
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